This chapter provides an overview of the JUnit 5 testing framework. Due to the limitations of JUnit 4 (monolithic architecture, impossibility of compose test runners, and limitations of test rules), a new major version of the framework was needed. In order to carry out the implementations, the JUnit Lambda project started a crowdfunding campaign in 2015. As a result, the JUnit 5 development team was born, and the GA release of the framework was released on September 10, 2017.
JUnit 5 was designed to be modern (that is, using Java 8 and Java 9 compliant from the very beginning) and modular. The three major components within JUnit 5 are: Jupiter (new programming an extension model), Platform (foundation for any testing framework executed in the JVM), and Vintage (integration with legacy JUnit 3 and 4 tests). At the time of this writing, JUnit 5 tests can be executed...
